<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script type="text/javascript" src="../JS/vue.js"></script>
</head>

<body>
  <div id="root">
    姓：<input type="text" v-model="firstName"></input><br></br>
    名：<input type="text" v-model="lastName"></input><br></br>
    <h2>姓名：{{fullName}}</h2>
  </div>
</body>
<script type="text/javascript">
  Vue.config.productionTip = false
  const vm = new Vue({
    el: '#root',
    data: {
      firstName: '张',
      lastName: '三'
    },
    computed: {
      // fullName: {
      //   get() {
      //     return this.firstName + this.lastName
      //   },
      //   set(value) {
      //     const arr = value.split('')
      //     this.firstName = arr[0]
      //     this.lastName = arr[1]
      //   }
      // }
      //简写
      fullName() {
        return this.firstName + this.lastName
      }
    }

  })
</script>

</html>